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4A0-205 : Nokia Optical Networking Fundamentals 2025 Exam
Nokia 4A0-205 Questions & Answers
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4A0-205
Nokia Optical Networking Fundamentals 2025
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Question: 244
combine multiple wavelengths onto a single fiber split a single wavelength into multiple wavelengths amplify the optical signal
filter out unwanted wavelengths wer: A
anation: The primary function of an optical multiplexer in a WDM sy ombine multiple wavelengths (or channels) onto a single optical fibe llows for the transmission of higher data rates by utilizing the wide able bandwidth of the fiber.
stion: 245
is the purpose of the optical time-domain reflectometer (OTDR) in al networks?
TDR is used to measure the optical power of the signal at different po
What is the primary function of an Optical Multiplexer in Wavelength Division Multiplexing (WDM)?
To
To
To
To
Ans
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is to c r.
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Que What optic
O ints
along the fiber.
OTDR is a technique for multiplexing multiple wavelengths onto a single fiber using WDM.
OTDR is used to locate and identify faults, splices, and other events along the length of an optical fiber.
OTDR is a method for compensating for chromatic dispersion in the optical fiber.
Answer: C
bleshooting.
stion: 246
ch of the following is a key advantage of using Wavelength Division iplexing (WDM) in an optical network?
ncreased transmission capacity by utilizing multiple wavelengths educed power consumption compared to single-wavelength systems mplified optical fiber installation and maintenance
ll of the above
wer: D
anation: WDM allows multiple wavelength channels to be transmitted gle optical fiber, dramatically increasing the total data capacity. It als ces the need for additional fiber infrastructure and simplifies network agement and maintenance compared to deploying multiple independen links.
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Question: 247
Which of the following is a key component in Nokia's Photonic Service Engine (PSE) architecture?
Optical cross-connect (OXC)
Dispersion compensating module (DCM)
Reconfigurable optical add-drop multiplexer (ROADM)
Intelligent optical controller (iOC) Answer: D
ptical network. It enables dynamic reconfiguration, wavelength alloca nd-to-end service provisioning, allowing for efficient utilization of ork resources and rapid response to changing traffic demands.
stion: 248
is the primary purpose of an Optical Wavelength Selective Switch S)?
multiplex multiple wavelength channels onto a single fiber. amplify optical signals.
selectively route or switch individual wavelength channels. convert between different fiber types.
wer: C
anation: The primary purpose of an Optical Wavelength Selective Swi
S) is to selectively route or switch individual wavelength channels. It
and e netw
Que
What (WS
To
To
To
To
Ans
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(WS
allows the network operator to dynamically control the flow of specific wavelength channels in an optical network.
Question: 249
Which of the following is a key characteristic of the Differential Phase Shift Keying (DPSK) modulation format?
It offers higher spectral efficiency compared to On-Off Keying (OOK).
It is more resilient to nonlinear effects in the fiber.
It provides better sensitivity and receiver performance.
anation: The Differential Phase Shift Keying (DPSK) modulation for several key advantages over On-Off Keying (OOK): higher spectral iency, better resilience to nonlinear effects in the fiber, and improved
tivity and receiver performance. These characteristics make DPSK a lar choice for high-speed and long-haul optical transmission systems.
stion: 250
is the role of the Optical Channel Transport Unit (OTU) in the OTN structure?
he OTU provides the payload area for transporting client signals over al network.
he OTU is responsible for the forward error correction (FEC) processi ptical data.
he OTU implements the Optical Supervisory Channel (OSC) for contr anagement.
he OTU adds the necessary overhead and framing to the ODU for
Expl mat
offers effic sensi popu
Que
What frame
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optic
T ng of
the o
T ol
and m
T
transmission over the optical fiber. Answer: D
Explanation: The Optical Channel Transport Unit (OTU) is the outermost layer of the OTN frame structure, and its primary role is to add the necessary overhead and framing to the Optical Channel Data Unit (ODU) payload. The
layer is responsible for incorporating functions like forward error ction (FEC), tandem connection monitoring, and other overhead mation required for the reliable transmission of the optical data over t optic network.
OTU
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fiber-
Question: 251
How does a Raman pump work in the 1830 specific implementation?
The amplification is done simultaneously for all channels as they enter the board.
As the incoming signal power increase, the gain of the amplifier is reduced.
The pump light travels in the same direction of the signal, amplifying it while it flows in the fiber towards the following node.
The pump light travels in the opposite direction of the signal to be amplified, amplifying it while it arrives from the adjacent node.
ation:
830 implementation, the Raman pump uses a technique called co-propagation, where the pump light (w the energy for amplification) travels in the same direction as the signal. This setup is used to amplify the
as it flows through the fiber towards the next node
ion: 252
f the following sentences about FlexGrid is false? Grid allows a more efficient channel spacing.
nnels in FlexGrid systems are allocated with a granularity of 27.5GHz.
Grid systems use specific sets of boards. Old generation WDM systems need to be upgraded to support id.
lexGrid is currently standardized by ITU-
er: B
ation:
atement is false. In a FlexGrid system, the channels are allocated with a granularity of 6.25 GHz, not 27. ows for more efficient use of the optical spectrum and better flexibility.
ion: 253
Answer: C Explan In the 1 hich provides signal Which o Flex Cha Flex FlexGr The F Explan This st 5 GHz. This all Which of the following statements is true about chromatic dispersion (CD)? Different channels have different bandwidth and this causes different CD performances. The fiber attenuation changes along the fiber, and when the light crosses these differences the CD takes place. Different wavelengths propagate at different speeds within the same media and therefore different colors travel in the fiber with different speed. The fiber attenuation introduces inter-channel interference. Explanation: Different wavelengths propagate at different speeds within the same media and therefore different colors travel in the fiber with different speed. This phenomenon is known as chromatic dispersion and causes light to spread out as it travels through the fiber over distance, leading to signal attenuation and distortion. The fiber attenuation does not introduce inter-channel interference, but it can cause attenuation of the signal. Different channels have different bandwidths, but this does not affect CD performance. ecting logs related to possible issue affecting a wavelength path king the protection path for a specific wavelength ing the end-to-end wavelength optical power ecting errors related to wavelength inconsistencies ation: avelength Tracker tool is used for real-time tracking and monitoring of wavelength paths in an optical ne unction is to trace the end-to-end optical power of a particular wavelength. This aids in network shooting and performance optimization. the purpose of the validate step in the EPT design process? ng this step, the configuration available on the involved network elements is compared with the design provided byEP step is used to measure optical power performances over an existing network before making changes. step is optional and is useful to verify the network element layout before going through the commission ng this step, the run design action is triggered for network design consistency check and errors fixing. ation: Which of the following applications is related to Wavelength Tracker tool? Coll Trac Trac Corr Explan The W twork. Its key f trouble What is Duri This This step. Duri Explan In the EPT design process, the validate step is crucial to compare the actual configuration of network elements with the design provided by EPT (Engineering Planning Tool). This step ensures that the network has been set up correctly according to the design. What is a degree-1 node? A node with only one direction and therefore a terminal node A node with only one express channel and therefore made of two sides A node with only east and west sides without directions towards north and south A node with one direction only and therefore used as In-Line-Amplifier (ILA) Explanation: A degree-1 node is a node that only has one direction, and it is therefore a terminal node. This means that the node only has one input and one output port. It does not have any other ports to connect to other nodes or fibers. This is a common feature of some optical transport networks, such as ring networks, where a degree-1 node serves as the endpoint of the ring. the function of a pre-amplifier in an optical network? ough the pre-amplifier, the optical signal is amplified at the receiver side after it travels along the fiber fr node. ough the pre-amplifier, the optical signal is amplified at the transmitter side before it is sent to the line sp ough the pre-amplifier, the optical signal is amplified both the receiver side and at the transmitter side. ough the pre-amplifier, the optical signal is amplified within the node internally to recover internal losse ance, to cascaded filters. ation: in function of a pre-amplifier in an optical network is to amplify the optical signal at the receiver end af velled along the fiber from the transmitter side. This ensures that the signal power is strong enough for d eceiver side. oes it take to get connected to the NSP platform? owser and the NSP IP address; and from the landing page, the NSP application should be downloaded and ed. owser and the NSP IP address. Then, a browser plugin needs to be installed and the laptop rebooted bef Quest What is Thr om another Thr an. Thr Thr s due, for inst Explan The ma ter it has tra etection at the r What d A br launch A br ore the NSP can be correctly reached. A browser, the NSP IP address, and the credentials to access the web-based interface (WebUI). The NSP package should be downloaded from the Nokia website and properly licensed for thespecific workstation to be used. Explanation: To get connected to the Nokia Service Platform (NSP) platform, you need a browser and the NSP IP address. Then, you need the credentials to access the web-based interface (WebUI) for the NSP platform. Once you have these, you can access the NSP platform from a web browser. Is it possible to mix PSS-24x and PSS-8x shelves In an SWDM configuration? Yes, as both can be equipped within the same node No, as they are not compatible and cannot be used within the same node Yes, but the PSS-24X shelf must be configured as a master Yes, but the PSS-8X shelf must be configured as a master ation: 24x and PSS-8x are Nokia Photonic Service Switches that can be equipped within the same node. They ha capacities but can coexist in the same configuration. the metro area network? etro area network is that portion of network that passes through a city to provide connections to severa ers. etro area network is located between access and core domains. etro area network is made of OCS/SWDM nodes only, as no pure photonic nodes are used here. etro area network is located in between two access area networks and made of photonic nodes only (n WDM nodes are used there). ation: opolitan Area Network (MAN) typically spans a city or campus and is larger than a local area network (LAN) aller than a wide area network (WAN). It often serves as the link between access and core networks, ating traffic from multiple access networks and transporting it to the core network.
Quest
Answ
Quest
Answer: C
Question: 254
er: C
ion: 255
er: A
Answ
Quest
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Question: 256
Answer: A
ion: 257
er: A
ion: 258
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Answer: C
Question: 259
er: A
ion: 260
er: B
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